Self-lubricating swing valve

Abstract

The application discloses a self-lubricating swing valve, which comprises a shell with a sealed inner cavity, coaxial upper and lower connecting pipes arranged on the shell, outer ends of the upper and lower connecting pipes extending out of the shell, and inner ends of the upper and lower connecting pipes extending into the inner cavity of the shell; a gap between adjacent ends of the upper and lower connecting pipes forms a valve hole; a valve plate capable of rotating around an axis is arranged in the inner cavity of the shell, and the valve plate is adapted to enter and close the valve hole to isolate the upper and lower connecting pipes when rotating; a rotating disc capable of rotating around another axis is arranged in the inner cavity of the shell, a coating brush is arranged on the rotating disc, a grease storage groove for storing grease is arranged on one side of the rotating disc adjacent to the coating brush; the rotating disc is adapted to enter the side of the rotating disc facing the coating brush when the valve plate rotates, and the coating brush is adapted to stick and take the grease in the grease storage groove and coat the outer wall of the valve plate in contact with the upper and lower connecting pipes when the rotating disc rotates; the valve plate can be automatically coated with the grease, and the continuous lubrication between the valve plate and the valve hole is maintained.

Description

Technical Field

[0001] This invention relates to a swing valve for sealing gas, and more particularly to a self-lubricating swing valve. Background Technology

[0002] Existing swing valves open and close by swinging a valve plate. During assembly, a layer of grease is applied to the valve plate to lubricate the friction between the valve plate and the valve orifice during sliding. However, with increasing service life, the grease on the valve plate gradually dries and disappears due to airflow within the valve orifice. When there is no grease on the valve plate, the sliding process between the valve plate and the valve orifice becomes sluggish, resulting in incomplete valve closure. In extreme cases, the valve may fail to close or open at all. To prevent this, it is necessary to continuously lubricate the valve plate and maintain the grease coating. Summary of the Invention

[0003] This invention provides a self-lubricating swing valve that can automatically apply grease to the valve plate to maintain continuous lubrication between the valve plate and the valve hole.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] This invention discloses a vertical transporter for concave parts, comprising a housing with a sealed inner cavity, an upper connecting pipe and a lower connecting pipe coaxially arranged on the housing, the outer ends of the upper and lower connecting pipes extending outside the housing, and their inner ends extending into the inner cavity of the housing; a valve hole is formed by the gap between adjacent ends of the upper and lower connecting pipes; a valve plate rotatable about one axis is provided in the inner cavity of the housing, which is adapted to enter and close the valve hole to isolate the upper and lower connecting pipes when rotating; a turntable rotatable about another axis is provided in the inner cavity of the housing, and a coating brush is provided on the turntable, with a grease storage tank for storing grease on the side of the turntable adjacent to the coating brush; when the valve plate rotates, it is adapted to enter the side of the turntable facing the coating brush, and when the turntable rotates, the coating brush is adapted to pick up the grease in the grease storage tank and apply it to the outer wall of the valve plate that contacts and mates with the upper and lower connecting pipes.

[0006] A pull-out hole is provided on the side wall of the housing. The grease storage tank is suitable for being pulled out and put into the working position in the inner cavity of the housing through the pull-out hole. When the grease storage tank is put into the working position, the contact surface between the grease storage tank and the pull-out hole is sealed.

[0007] The inner wall of the housing is provided with a pair of upper slide rails and a lower slide rail. The grease reservoir is suitable for sliding along the upper and lower slide rails. A limiting block is provided between the upper slide rail and the lower slide rail. The limiting block is suitable for positioning the working position of the grease reservoir.

[0008] The coating brush includes a brush head and bristles. The brush head is slidably fitted in the brush head groove in the turntable, and the brush head and the opposite wall of the brush head groove are connected by a spring.

[0009] The valve plate includes a sealing plate and a rocker arm connected to each other. A switch motor is provided on one side of the rocker arm, which is adapted to drive the rocker arm to rotate and reciprocate around its rotor axis. The sealing plate is adapted to enter and close the valve hole. A rotary motor is provided on one side of the turntable, which is adapted to drive the turntable to rotate forward and backward. A coating brush is adapted to apply grease to the outer wall of the sealing plate that contacts and mates with the upper and lower connecting pipes.

[0010] A scraper is provided on the inner wall of the grease reservoir after it has been brushed with a coating brush. The scraper is suitable for scraping off excess grease from the bristles of the coating brush when the grease is carried out of the grease reservoir.

[0011] The valve plate includes a swing arm connected to a switch motor rotor located in the middle and on one side. A sealing plate and a sealing ring are respectively connected to the two ends of the swing arm. The switch motor is adapted to drive the swing arm to rotate and reciprocate around its rotor axis. The sealing plate is adapted to enter and close the valve hole. The sealing ring is adapted to enter the valve hole and isolate the inner and outer cavities of the valve hole. The coating brush is adapted to apply grease to the outer wall of the sealing plate and / or the sealing ring that contacts and mates with the upper and lower connecting pipes.

[0012] The housing is provided with an exhaust port that connects the inner cavity of the housing to the outside, and the exhaust port is suitable for connection with an external air pump.

[0013] The beneficial effects of this invention include:

[0014] (1) The self-lubricating swing valve of the present invention utilizes a valve plate, a coating brush and a grease reservoir located on the same side of the turntable. When the turntable rotates, the coating brush applies the grease in the grease reservoir to the outer wall of the valve plate that contacts and fits with the upper and lower connecting pipes.

[0015] (2) The pull hole facilitates the removal of grease from the grease tank for adding lubricating grease. The sealing fit between the pull hole and the grease tank ensures that the grease tank is sealed with the pull hole when it is in the working position, preventing gas from escaping from the inner cavity of the housing.

[0016] (3) The upper and lower slide rails limit the movement of the grease tank to ensure that the grease tank moves smoothly when it is pulled out and reset through the pull hole. The limit block ensures that the grease tank can be accurately stopped at the working position when it is reset.

[0017] (4) By utilizing the elastic force of the spring, and with the brush bristles of the brush head of appropriate length, the brush bristles are made to fit the grease tank and valve plate, so as to give full play to the coating effect of each brush bristle.

[0018] (5) By using a switch motor to drive the reciprocating swing of the lever and a rotary motor to drive the forward and reverse rotation of the turntable, the coating efficiency of the coating brush on the valve plate and the coating uniformity of the coating brush on the valve plate surface are further improved.

[0019] (6) The scraper removes excess grease from the bristles of the coating brush, which improves the consistency of the grease adhering to each bristle, thereby further improving the uniformity of coating on the valve plate surface.

[0020] (7) The sealing ring is used to enter the valve hole to isolate the inner and outer cavities of the valve hole, that is, to prevent the gas in the upper and lower connecting pipes from entering the inner cavity of the housing from the valve hole, while ensuring the connection between the upper and lower connecting pipes; the coating brush is used to coat the sealing ring, which can also transfer the grease to the wall surface of the upper and lower connecting pipes that are in contact with the sealing ring, so as to lubricate the valve hole and valve plate.

[0021] (8) The exhaust port on the housing is used to connect to an external air pump so that when the swing valve with sealing ring switches from the closed state to the open state, the gas leaking into the housing cavity from the valve hole can be extracted, so as to avoid the gas from contacting the components inside the housing for a long time and affecting the normal operation of the components. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a three-dimensional schematic diagram of the top of the swing valve in Embodiment 1 of the present invention;

[0024] Figure 2 This is a three-dimensional side view of the swing valve according to Embodiment 1 of the present invention;

[0025] Figure 3 This is a three-dimensional schematic diagram of the bottom of the swing valve in Embodiment 1 of the present invention;

[0026] Figure 4 This is a three-dimensional schematic diagram of the bottom inner cavity of the swing valve in Embodiment 1 of the present invention. Figure 1 ;

[0027] Figure 5 This is a three-dimensional schematic diagram of the bottom inner cavity of the swing valve in Embodiment 1 of the present invention. Figure 2 ;

[0028] Figure 6 This is a three-dimensional schematic diagram of the grease storage tank of the swing valve in Embodiment 1 of the present invention;

[0029] Figure 7 This is an enlarged view of the inner cavity component of the swing valve according to Embodiment 1 of the present invention;

[0030] Figure 8 This is a cross-sectional view of the inner cavity component of the swing valve according to Embodiment 1 of the present invention;

[0031] Figure 9 This is a three-dimensional schematic diagram of the swing valve in the closed state according to Embodiment 1 of the present invention;

[0032] Figure 10 This is a schematic diagram of the rubber seat structure of the swing valve in Embodiment 1 of the present invention;

[0033] Figure 11 This is a structural diagram of the valve plate according to Embodiment 2 of the present invention;

[0034] Figure 12 This is a schematic diagram of the swing valve in the open state according to Embodiment 2 of the present invention;

[0035] Figure 13 This is a schematic diagram of the swing valve exhaust port structure in Embodiment 2 of the present invention.

[0036] In the diagram: 1. Housing; 2. Top cover; 3. Upper connecting pipe; 4. Valve hole; 5. Lower connecting pipe; 6. Switch motor; 61. Rotor II; 7. Support rod; 8. Connecting arm; 9. Turntable; 10. Bushing; 11. Rotary motor; 111. Rotor I; 12. Pull-out hole; 13. Grease reservoir; 131. Base plate; 132. Straight baffle; 133. Arc baffle; 134. Scraper; 135. Handle; 14. Exhaust hole; 15. Lower cover; 16. Valve plate; 161. Sealing plate; 162. Swing rod; 163. Sealing ring; 17. Coating brush; 171. Brush head; 172. Brush bristles; 18. Spring; 19. Limiting block; 20. Upper slide rail; 21. Lower slide rail; 22. Brush head groove; 23. Rubber seat ring. Detailed Implementation

[0037] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0038] Example 1

[0039] like Figure 1-10 As shown, a self-lubricating swing valve includes a circumferentially closed housing 1. An upper cover 2 and a lower cover 15 are respectively provided inside the housing 1, forming an inner cavity between the upper and lower covers. An upper connecting pipe 3 is sealed through the upper cover 2 at one end of the housing 1, and a lower connecting pipe 5 is sealed through the lower cover 15 at the same end of the housing 1. The upper and lower connecting pipes share a common axis of symmetry and have the same inner and outer diameters. The adjacent ends of the upper connecting pipe 3 and the lower connecting pipe 5 are separated to form a valve hole 4. A circular hole is formed between the upper cover 2 at the other end of the housing 1 and the housing 1. An annular bushing 10 is fixedly provided inside the circular hole. A cylindrical turntable 9 is rotatably fitted inside the bushing 10. The turntable 9 is parallel to the center lines of the upper connecting pipe 3 and the lower connecting pipe 5. The bushing 10 is sealed to the inner wall of the circular hole, and the turntable 9 is sealed to the bushing 10 during rotation. Figure 8As shown, multiple brush head grooves 22 are evenly distributed along the circumferential and radial directions on the bottom wall of the turntable 9. A brush head 171 of the coating brush 17 is slidably fitted in each brush head groove 22. A spring 18 is connected between the brush head 171 and the wall surface opposite to the brush head groove 22. Multiple sets of bristles 172 are provided at the end of the brush head 171 that extends out of the brush head groove 22.

[0040] A pair of annular slide rails, the upper slide rail 20 and the lower slide rail 21, are fixedly provided on the inner wall of the housing 1 located below the turntable 9, sharing a common center line with the turntable 9. Both have the same inner and outer diameters. A pull-out hole 12 is provided on the side wall of the housing 1 away from the upper and lower connecting pipes. A grease storage tank 13 is adapted to pass through the pull-out hole 12 and slide between the upper and lower slide rails. The grease storage tank 13 includes a semi-circular base plate 131 and straight baffles 132 and arc-shaped baffles 133 surrounding the base plate 131. The straight baffles 132 and arc-shaped baffles 133 are higher than the base plate 131 and are adapted to form a groove for storing grease within them. When the grease storage tank 13 passes through the pull-out hole 12, the contact surfaces of the straight baffles 132, arc-shaped baffles 133, base plate 131, and pull-out hole 12 slide in a sealing manner. When the grease reservoir 13 slides relative to the upper and lower rails, the upper and lower rails slide in close contact with the contact surfaces of the straight baffle 132, the arc-shaped baffle 133, and the bottom plate 131. During the sliding process, the upper and lower rails limit the grease reservoir 13 along the symmetrical center line of the upper and lower rails. A pair of limiting blocks 19 are provided in the middle of the upper and lower rails. These limiting blocks 19 are symmetrically arranged on the upper and lower rails and are suitable for limiting the two ends of the straight baffle 132 of the grease reservoir 13. As a preferred embodiment, the arc-shaped baffle 133 has the same outer diameter as the upper and lower rails, so that there is a larger support surface between the arc-shaped baffle 133 and the upper and lower rails, improving the stability of the support. To facilitate the pulling out of the grease reservoir 13, a handle 135 is provided on the outer wall of the arc-shaped baffle 133. When the straight baffle 132 abuts against the pair of limiting blocks 19, a portion of the arc-shaped baffle 133 remains within the pull-out hole 12, and the two are adapted to seal against each other. The handle 135 is located outside the pull-out hole 12, at which point the grease reservoir 13 is in the working position. Preferably, the straight baffle 132 has a scraper 134 along its axial direction on the sidewall facing the arc-shaped baffle 133.

[0041] A coaxial rotary motor 11 is provided on the upper side of the turntable 9. The outer end of the downward-facing rotor 111 of the rotary motor 11 is connected to the top wall of the turntable 9. The side wall of the rotary motor 11 is connected to one end of the connecting arm 8, and the other end of the connecting arm 8 is connected to the side wall of the switch motor 6. The centerline of the switch motor 6 is parallel to the upper and lower connecting pipes and the turntable 9; further, the centerline of the switch motor 6 is located in the plane formed by the centerlines of the upper and lower connecting pipes and the turntable 9. The lower end of the switch motor 6 is fixed to the top wall of the upper cover 2 by a pair of support rods 7. The downward-facing rotor 61 of the switch motor 6 passes through the through hole of the upper cover 2 and extends into the inner cavity of the housing 1. The end of the rotor 61 extending into the inner cavity of the housing 1 is fixedly connected to one end of the swing rod 162 of the valve plate 16, and the other end of the swing rod 162 is fixedly connected to the disc-shaped sealing plate 161 of the valve plate 16. The switch motor 6 is adapted to drive the swing rod 162 and the sealing plate 161 to rotate. When the sealing plate 161 is fully inserted into the valve hole 4, the two walls of the sealing plate 161 respectively seal and cooperate with the adjacent surfaces of the upper connecting pipe 3 and the lower connecting pipe 5, blocking the passage between the upper connecting pipe 3 and the lower connecting pipe 5, thus putting the swing valve into the closed state. Figure 10 As shown, as a preferred embodiment, to further enhance the sealing performance, rubber seat rings 23 are fixedly installed on the end walls of the upper connecting pipe 3 and the lower connecting pipe 5 that mate with the sealing plate 161. Figure 7-8 As shown, the switch motor 6 is adapted to drive the sealing plate 161 through the gap between the upper slide rail 20 and the lower slide rail 21 and into the area below the turntable 9, away from the grease tank 13. The upper connecting pipe 3 and the lower connecting pipe 5 are respectively sealed to the external pipes to be connected, thereby realizing the opening and closing of the external pipes.

[0042] The working principle of the self-lubricating swing valve of the present invention is as follows:

[0043] Adjust the switch motor 6 to rotate the sealing plate 161 into the valve hole 4, thus sealing the passage between the upper connecting pipe 3 and the lower connecting pipe 5 and closing the swing valve. At this time, pull the grease tank 13 out of the pull hole 12 through the handle 135, add solid lubricating substances such as grease or paraffin into the grease tank 13, and then send the grease tank 13 back into the pull hole 12 through the handle 135, so that the straight baffle 132 abuts against a pair of limit blocks 19. At this time, the grease tank 13 and the adjacent wall of the pull hole 12 are sealed together to prevent the inner cavity of the housing 1 from communicating with the outside. When the swing valve needs to be opened, the switch motor 6 drives the sealing plate 161 to leave the valve hole 4 and enter the space between the upper slide rail 20 and the lower slide rail 21. At this time, the rotary motor 11 works and drives the turntable 9 to rotate. The coating brushes 17 below it move back and forth between the grease tank 13 and the sealing plate 161. Under the elastic force of the spring 18, the bristles 172 of each brush head 171 maintain the pressure on the grease tank 13 and the sealing plate 161. When the bristles 172 pass through the grease reservoir 13, the grease in the grease reservoir 13 is adhered to the bristles 172. When the bristles 172 pass through the scraper 134 on the straight baffle 132, the scraper 134 is adapted to scrape off the excess grease on the bristles 172. After the bristles 172 pass over the straight baffle 132, they first contact the edge sidewall of the sealing plate 161 and apply a portion of the grease to the edge of the sealing plate 161. Then they flip over to the top wall of the sealing plate 161 and apply another portion of the grease to the top wall. When the bottom end of the edge sidewall of the sealing plate 161 is coated with a sufficient amount of grease, a portion of the grease will be pushed by the subsequent bristles to the circumferential edge of the bottom wall of the sealing plate 161, so that the edges of the top and bottom walls of the sealing plate 161 are covered with grease, and the entire top wall of the sealing plate 161 is covered with grease. To ensure a more uniform application of grease to the circumferential edges of the top and bottom walls of the sealing plate 161, during the coating process, the switching motor 6 drives the sealing plate 161 to swing back and forth within a set angle range. Simultaneously, the rotary motor 11 drives the turntable 9 to rotate forward and backward, continuously changing the rotation speed of the turntable 9. Ultimately, a uniform layer of grease is applied to the edge walls, bottom edges, and the entire top wall of the sealing plate 161. When it is necessary to close the swing valve again, the switching motor 6 is adjusted to rotate the sealing plate 161 into the valve hole 4, sealing the passage between the upper connecting pipe 3 and the lower connecting pipe 5. At this time, the sealing plate 161 transfers the grease on it to the surfaces of the upper connecting pipe 3, lower connecting pipe 5, and the sealing plate 161 that are in contact with it, thereby lubricating the valve hole 4 and the valve plate 16. As a preferred option, the upper connecting pipe 3 is connected to the airflow inlet of the airflow channel. This is because the top wall of the sealing plate 161 is covered with a layer of grease. When the swing valve is closed, the top wall of the sealing plate 161 faces the upper connecting pipe 3. There is still high-pressure gas in the airflow channel connected to the upper connecting pipe 3. If the gas is corrosive, the grease on the top wall of the sealing plate 161 can be used to isolate the gas and prevent it from corroding the sealing plate 161.

[0044] Example 2

[0045] like Figure 11-13 As shown, the difference between this embodiment and Embodiment 1 is that the valve plate 16 includes a swing rod 162 connected in the middle to the rotor 61 of the switching motor 6. One end of the swing rod 162 is still connected to the sealing plate 161, and the other end is connected to an annular sealing ring 163. When the switching motor 6 rotates and drives the sealing ring 163 into the valve hole 4, the sealing ring 163 seals with the contact surfaces of the upper connecting pipe 3 and the lower connecting pipe 5, thereby preventing gas in the upper connecting pipe 3 and the lower connecting pipe 5 from leaking from the valve hole 4 into the inner cavity of the housing 1, while simultaneously enabling communication between the upper connecting pipe 3 and the lower connecting pipe 5. An exhaust hole 14 is provided on the upper cover 2 to connect the inner cavity of the housing 1 with the outside. This exhaust hole 14 is connected to an external air pump (not shown in the figure) through an air pipe. When the swing valve switches from the closed state to the open state, the switching motor 6 drives the sealing plate 161 to move out of the valve hole 4. At this time, the valve hole 4 is not sealed, and the inner cavity of the housing 1 is connected to the upper connecting pipe 3 and the lower connecting pipe 5.

[0046] When it is necessary to apply grease to the sealing plate 161, the application steps in Example 1 shall be followed. If no grease application is required or has already been completed, the sealing ring 163 shall be rotated into the valve hole 4 by the switch motor 6, thereby isolating the upper and lower connecting pipes from the inner cavity of the housing 1 while keeping the swing valve open. Afterward, the vacuum pump shall be turned on to discharge the residual gas that leaked into the inner cavity of the housing 1 through the upper and lower connecting pipes when the swing valve was first opened.

[0047] As a preferred embodiment, when the switch motor 6 drives the rocker arm 162 to rotate, the sealing ring 163 can also enter between the upper slide rail 20 and the lower slide rail 21. When the turntable 9 rotates, the coating brushes 17 below it move back and forth between the grease reservoir 13 and the sealing ring 163. Under the elastic force of the spring 18, the bristles 172 of each brush head 171 maintain a pressing force on the grease reservoir 13 and the sealing ring 163, thereby applying grease to the edge sidewalls, bottom edge, and the entire top wall of the sealing ring 163.

[0048] When the sealing ring 163 enters the valve hole 4, the sealing ring 163 transfers the grease on it to the wall surface of the upper connecting pipe 3 and the lower connecting pipe 5 that are in contact with the sealing ring 163, which can also lubricate the valve hole 4 and the valve plate 16.

[0049] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, the first object can be one or several. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0050] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the component itself.

Claims

1. A self-lubricating swing valve, comprising a housing (1) having a sealed inner cavity, characterized in that: The housing (1) is provided with an upper connecting pipe (3) and a lower connecting pipe (5) on the same axis. The outer ends of the upper and lower connecting pipes extend out of the housing (1) and their inner ends extend into the inner cavity of the housing (1). The gap between the adjacent ends of the upper and lower connecting pipes forms a valve hole (4). The inner cavity of the housing (1) is provided with a valve plate (16) that can rotate around one axis. When the valve plate (16) rotates, it is suitable to enter and close the valve hole (4) to isolate the upper and lower connecting pipes. The inner cavity of the housing (1) is provided with a turntable (9) that can rotate around another axis. The turntable (9) is provided with a coating brush (17). A grease storage tank (13) for storing grease is provided on the side of the turntable (9) adjacent to the coating brush (17). When the valve plate (16) rotates, it is suitable to enter the side of the turntable (9) facing the coating brush (17). When the turntable (9) rotates, the coating brush (17) is suitable to pick up the grease in the grease storage tank (13) and apply it to the outer wall of the valve plate (16) that contacts and fits with the upper and lower connecting pipes. A pull-out hole (12) is provided on the side wall of the housing (1). The grease storage tank (13) is adapted to be pulled out and put into the working position in the inner cavity of the housing (1) through the pull-out hole (12). When the grease storage tank (13) is put into the working position, the contact surface between the grease storage tank (13) and the pull-out hole (12) is sealed. A scraper (134) is provided on the inner side wall of the grease reservoir (13) that has been swept by the coating brush (17). The scraper (134) is suitable for scraping off excess grease from the bristles (172) of the coating brush (17) when the grease is carried out from the grease reservoir (13).

2. The self-lubricating swing valve according to claim 1, characterized in that: The inner wall of the housing (1) is provided with a pair of upper slide rails (20) and lower slide rails (21). The grease tank (13) is suitable for sliding along the upper and lower slide rails. A limiting block (19) is provided between the upper slide rail (20) and the lower slide rail (21). The limiting block (19) is suitable for positioning the working position of the grease tank (13).

3. The self-lubricating swing valve according to any one of claims 1-2, characterized in that: The coating brush (17) includes a brush head (171) and bristles (172). The brush head (171) is slidably fitted in the brush head groove (22) in the turntable (9). The brush head (171) and the opposite wall of the brush head groove (22) are connected by a spring (18).

4. The self-lubricating swing valve according to any one of claims 1-2, characterized in that: The valve plate (16) includes a sealing plate (161) and a rocker arm (162) connected to each other. A switch motor (6) is provided on one side of the rocker arm (162). The switch motor (6) is adapted to drive the rocker arm (162) to rotate and reciprocate around its rotor axis. The sealing plate (161) is adapted to enter and close the valve hole (4). A rotary motor (11) is provided on one side of the turntable (9). The rotary motor (11) is adapted to drive the turntable (9) to rotate forward and backward. A coating brush (17) is adapted to apply grease to the outer wall of the sealing plate (161) that contacts and cooperates with the upper and lower connecting pipes.

5. The self-lubricating swing valve according to any one of claims 1-2, characterized in that: The valve plate (16) includes a swing arm (162) connected to the rotor of a switch motor (6) located in the middle and on one side. The two ends of the swing arm (162) are respectively connected to a sealing plate (161) and a sealing ring (163). The switch motor (6) is adapted to drive the swing arm (162) to rotate and reciprocate around its rotor axis. The sealing plate (161) is adapted to enter and close the valve hole (4). The sealing ring (163) is adapted to enter the valve hole (4) and isolate the inner and outer cavities of the valve hole (4). The coating brush (17) is adapted to apply grease to the outer wall of the sealing plate (161) and / or the sealing ring (163) that contacts and cooperates with the upper and lower connecting pipes.

6. The self-lubricating swing valve according to claim 5, characterized in that: The housing (1) is provided with an exhaust port (14) that connects the inner cavity of the housing (1) to the outside. The exhaust port (14) is suitable for connection with an external air pump.

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